Intermittent starting device for internal-combustion motors



E. M. BORGO.

INTERMITTENT STARTING DEVICE FOR INTERNAL COMBUSTION MOTORS. 1,406,146.

a 9L 4/1 IN u 1 mm Q09 r Ti 2 m F a a D1 0 E. M. BO RGO. INTERMITTENT STARTING DEVICE FOR INTERNAL COMBUSTION MOTORS.

APPLICATKON FILED FEB. 25, I920.

Patented Feb. 7, 1922.

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*UNI'TED stares RPATE NT OFFICE.

"EDMONDO'HICHELE 'LBORGO, 0F TURIN, ITALY.

m'renmrr'rmrr vSumerian Device m mrmnr-co'mnusrron morons.

Specification of Letters Patent.

. Patented Feb. 7,1922.

Application filedlebruary 25, 1926. Serial No. 361,20.

T0 all whom it may concern Be it known that LEDMONDO MICHELE 'BORGO, a subject of the King "of Italy, re-

siding at Turin, Italy, have invented cer- 133,111 new and 'useful Improvements in Intermittent Starting Devices for Internal- Cornbusti'on Motors; and: I do h e y clare the following to bea full, clear, and exact description of the invention, such as will enable others skilled "in theart towhich' 'it appertains to make and..'use the same, reference being'had to the accompanying" member, connected directly or indirectly with the mOtorSh'aft, andintended 'to be rotated in one" direction only and man" intermittent manner-by an' engaging pawl yieldingly connected to and capable. ofv 0scillating' on a driving. shaft'operated in opposition tothe action of a return spring,

by means, of a' pedal or handle. This driving-shaft is-placed parallel'to the axis of the internal toothed" member but slightly eccentrically in: respect to 'it, "so ':t'hat [the "engagement of the engaging pawl with the latter takes place for an'angulariamplitude of-less than one] complete rotation'i'of the driving shaft.

' means, preferably 7 yielding in character, are

provided for stopping thedriving shaft at the end of: its return :stro'keimsuch' a position that .the engaging pawl 'is out of engagement "from the teeth" of the? internal toothed member. I

. motor of amotorcycle.

' ever,

A constructional form of this starting device is hereinafter described with refer-' ence tothe annexed drawing'g to "illustrate,' the application to the It is obvious, howby way of example,

7 ithat'the said application 'is' here "described and ei al viewin side; elevation ofifthe application of the startingf'device *to the motorcycle Figures 2 and- 3*show"in"'detai1*v1ews the In '*this starting device internal teeth, preferably in. the shape-of each tooth is preferably broad curve,the1tops 1' iounded ofi.

illustrated only. by *way of explanation-and consequently not to be taken as limiting "the applicationflofithe' in-;

"of *the cavity starting device in a longitudinal section and an end view respect1vely;-F1gures l and 5 show the internal toothed member and the a transverse section on the line pawl in different working positions F igures'i6, 6?, 7,8, 9 are details.

Inthe example shown "in the drawing theinternal toothed member lintendedlto be operated by the engaging pawl 21s con-' nected indirectly withthe shaft 3Jof the motor arranged .forinstance longitudinally to the vehicle. gln factsaid 'rnember'l is connected or in one piecewith thecounter shaft 4 of. the change speed "gear of the vehicle located inside-the motor'casing 5 and receiving the movement" from the'main shaft 6 by means of the toothed wheel 7 enga ing the, teeth 8 milled 'on the outer side of the member 1. The main: shaft 6, which is provided externally with the [s'prock'eti9 serving to drive,1by means of a chain', the

rear wheel 10 of themotorcycle,"is driven in its turn by the .shajft3 of the motor by means of .two'bevel gears 11, 12*which are connected toithe saidshaft 3 and Wheel 7 respectively. The arrangement described above relating to the indirect connection of member 1 with the shaft 3 of the "motor is quite peculiar to the example of application represented in the drawing and may therefore vary according to the'fonnandilocation inthe vehicle of themotor to which the starting device is applied. if V The element '1 "(see Figs. 4 and 5) shows a ratchet wheel in which' the bottom 1 of rounded oflirin a being also slightlyv f-The engaging. pawl '2 [(see- Fig.8) is mounted, free to oscillate slightly, in a cavity 13 (see Fig. 6) of the head 14 ofthe driving shaft 15' after the'insertionzin the interior of said cavity of a flat spring 16"(see Fig. .9): *This'spring is suitably shapedftofengage by its book 16 over the tenninaledge l4 ofthe head 14 provided with the cavity 13, 'an d to bear partially against the inner outer walls ofLthe pawl 2 in such a manner as tomaintain'the latter in 'a"middle iposition, as illustrated by Fig. 4. The :paw1 2;.and the; spring. 16 are: retained in i the interior a ls 13', 13" ofsaid cavity, acting on the 106 '13 by the fiat head 17' of memo screw 17 (see Fig. '7) passing through the hole 2 of the pawl and screwed to the screw-threaded hole 14" of the head of the driving shaft 15. q 3 V The driving shaft is mounted capable of rotating, inthe interior of the support sleeve 18, which, by means of its flange 18', is fixed by means of screws 19, for instance, to the motor or change speed case 5 in such away that while the head 14 of the shaft with the pawl 2 is seen to be within the direction indicated by g '1 and 3, is effected opposite to the torsion being brought to its 'is held in this position by for instance, by the pin 25 fixed to the flange member 1, the axis w. w of the shaft 15 .(see Fig. 2) is parallel to the axis 1 of the member 1 but slightly eccentrically disposedin respect to the latter, to'a given amount-e. The shaft 15 is provided at its outer end with the operating crank 20 having a jointed head or pedal capable of osition of rest as shown by thedotted lines 1n Fig. 3. This head is formed by the rod 22 pivoted by the screw 21 to the head of the pedal and on which is mountedthe sleeve 23 which is capable of turning, and is made preferably of aluminium, having a prismatic shape with, for in stance, a triangular cross section, so as to make a good support for the foot by which the pedal is operated. If the starting device is to be worked .by the hand the shaft 15 may be provided with with a suitable grip.

The operation of this shaft 15 in the the arrows in Figs.

a handle equipped spring 24, placed on the inner prolongation of thesleeve 18 and engaged with its ends in suitable holes milled in the head 14 of shaft 15 and in the flange 18' of sleeve 18 respectively. The shaft 15, brought back to its normal position of rest by the spring 24,

any stop means,

1 18' and against which the head 14 of the shaft rests. This pin, preferably elastic for the purpose of absorbing the impact when the,

operating memberreturns to its position of rest, is-formed by a spiral steel wire tightly wound upon itself;

the example represented,.the said 65,

. fastened tothls which bearthe it, as is and screw-threaded .ends of the said stirin s 29.

[be working of, the device is asfollowsz In the rest position, that i when the head nuts 31 screwed to the jointed 14 of the shaft 15, forced by the spring 24 bears against the stop 25, the pawl 2 is in the position of Fig.4 out of engagement from the internal toothed member 1.

By causing the pedal 20 to turn, in the direction of the arrows in Figs. 1 and 3, acting, for instance, with the foot on the sleeve or pedal 28, the pawl 2, owing to the eccentricity. between the shaft 15 and the internal toothed member 1,isengaged with the teeth of the latter, as shown by the dotted lines in Fig. 4. The engagement of the end of the pawl 2 with the teeth of 1 may take place at once in an. efficient mannerat the bottom 1 of'a tooth, or man lnefiicleut the latter case breakages need not be feared for, owing to the spring mounting of the pawl 2 by means of the spring 16, the said pawl, by oscillating in either direction, slides immediately tothe bottom 1 of the corresponding tooth or of the-one following and is brought finally to the eflicient position of en a ement marked in full lines in Fi 5. g Q a Contmuing then the movement of the pedal 20,-the pawl 2, which after having pressed down the spring 16, rests completely on the shoulder 13' of the cavity 13, sets in ro- 480 manner at the top 1 of a tooth. Even in,

tation the member 1. After havlng acco1n- Y plished a rotation of about 180 and owing to the eccentricity between 15 and 1, the pawl 2 once more comes out of engagement with the teeth 1, as shown by dotted lines in Fig. 5. Releasing the pedal 20, it is acted upon by the. spring 24, and returns to its initial position and with it returns also the pawl 2, which oscillating in rection to the shoulder 13" of the cavity 13, slides past the teeth of the member 1 which remains motionless, and returns to the initial position of Fig. 4. By repeating intermittentlythe action of the pedal inthe direction of the arrows in Figs. 1 and 3, the element 1 is placed in intermittent rotation,

the opposite diand this latter through the toothed wheels.

8, 7 and 12,11, rotates the shaft 3 of the motor, which is thus started. I I

Once the startin is accomplished the member 1 rotates wit the other parts of the motor and its teeth 1', 1" rotate fre el font of engagement from the pawl 2, whic has returned meanwhile to its rest position as in Fig. ,4. I In the example described above the internal toothed member and its pawl are located in thechange speed case 5 and this is veryadvanta'geous. for the purpose of insur-' 7 ing a greater durabilityto'the mechanism,

.but it is evident that these elements could i just-as well be I claim: 1

1. An engine starting mechanism,..comprising, an internally toothed. ratchet wheel placed freely on the outside.

ing crank sheft wh seaxis is ofi-set from for the shaft for starting the motor, a start with said ratchet teeth,

the centerof said wheel, and a pawl carried on said crank shaft for engagement whereby said pawl will travel in a path eccentric to the ratchet teeth to automatically engage and disengage said teeth.

2. An engine starting mechanism, comprising an internally toothed ratchet wheel for the shaft for starting the motor, the

bases of the interdental spaces of said wheel v being rounded, a crank-shaft whose axis is off-set from the axis of said Wheel, and

a pivoted pawl carried by said crank shaft for engagement with said teeth.

3. An engine starting mechanism comprising an internally toothed ratchet wheel for the shaft for starting the motor, the bases of the interdental spaces of said wheel being rounded and the ends of the teeth .being rounded, a crank-shaft whose axis is off-set from the axis of said wheel, a head on said shaft having a pawl receiving recess, a pawl pivoted in said recess and limited in its movement by the walls of said recess. V

4. An engine starting mechanism comprising an internally toothed ratchet wheel for the shaft for starting the motor, the bases of the interdental spaces of said wheel being rounded and the ends of the teeth being rounded, a crank shaft whose axis is off-set from the axis of said wheel, a head on said shaft having a recess therein, a pawl pivoted in said recess and a spring to hold said pawl in middle position in said recess.

5. An engine starting mechanism comprising an internally toothed ratchet wheel, a rotatable crank shaft, a head thereon, a pawl in said head arranged to engage said teeth during a partial revolution, a yielding stop for said head and a coil spring on said shaft to return the shaft to initial position and the head against said stop.

6. An engine starting mechanism com:- prising an internally toothed ratchet wheel, a rotatable crank shaft, a head thereon, a pawl in said head arranged to engage the teeth of said wheel for a partial rotation only, and a crank actuating member pivoted to the end of said crank to swing into and out of operating position.

7. In a starting mechanism, a motor casing, an internally toothed starting ratchet wheel mounted therein, a flanged sleeve secured to said casing, a crank-shaft mounted in said sleeve whose axis is off-set from the axis of said wheel, a head on said shaft, a pawl pivoted in said head tov engage the teeth of said wheel for a partial revolution, means to secure said sleeve to a vehicle frame element, a spring stop and a spring to return the crank shaft to initial position with'the head against said stop.

In testimony that I claim the foregoing as my invention, I have si ned my name.

EDMONDO MIC ELE BORGO. 

